单项选择题
A.Move the power supply voltage switch to 220 volts.
B.Add an additional fan to help cool the computer.
C.Replace the cable that attaches the power supply to the motherboard.
D.Replace the power supply.
单项选择题 AtechnicianreceivesaworkorderrequestingtheinstallationofanNLXmotherboardintoamicroATXcase.Whichofthefollowingshouldthetechnicianrecognize？（）
单项选择题 WheninstallinganewPlugandPlaysoundcard，atechnicianshouldturnoffandunplugthecomputer；removethecomputer’scover；locatethesoundcardslot，insertandsecurethecardintheslotand：（）
单项选择题 AtechnicianistroubleshootingaCD/DVDdrive.Thereisadiskinthedriveandthetraywonteject.WhichofthefollowingactionsshouldthetechniciantakeFIRST？（）